Gathering research data

ABSTRACT

Systems and methods for gathering research data using multiple monitoring devices are provided. At least a pair of the monitoring devices each read ancillary codes contained within media data and which represents research data. The decoded data read by at least one of the pair is associated with a further set of data offering a correspondence between each of the sets of decoded data. Such correspondence allows a determination that the data decoded by each of the pair of monitoring devices is the same.

This application claims priority benefit of U.S. Provisional PatentApplication No. 60/978,117, filed Oct. 6, 2007, the contents of whichare incorporated herein by reference.

Methods and systems for gathering research data are disclosed.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1A illustrates a first instance of reception of data encoded withan ancillary code according to a preferred embodiment of the invention.

FIG. 1B illustrates a second instance of reception of data encoded withan ancillary code according to a preferred embodiment of the invention.

FIG. 2A illustrates an exemplary set of data such as would be labeledData Set 1 of FIG. 1B.

FIG. 2B illustrates an exemplary data set in which multiple elements areomitted from Data Set 1 of FIG. 1B.

FIG. 2C illustrates a research data gathering system for processingresearch data according to a preferred embodiment of the invention.

FIG. 3 illustrates a block diagram of a research data gathering systemfor processing research data according to a preferred embodiment of theinvention.

FIG. 3A illustrates a process flow chart relating to the system of FIG.3.

FIG. 4 illustrates a research data gathering system for processingresearch data according to another preferred embodiment of theinvention.

FIGS. 5 and 5A illustrate a block diagram of a cellular telephonemodified to execute a research operation according to a preferredembodiment of the invention.

FIG. 6 illustrates a block diagram of a personal digital assistantmodified to execute a research operation according to a preferredembodiment of the invention.

FIGS. 7A and 7B illustrate a system for determining proximity of twoportable research monitors according to a preferred embodiment of theinvention.

SUMMARY OF THE INVENTION

For this application, the following terms and definitions shall apply:

The term “data” as used herein means any indicia, signals, marks,symbols, domains, symbol sets, representations, and any other physicalform or forms representing information, whether permanent or temporary,whether visible, audible, acoustic, electric, magnetic, electromagneticor otherwise manifested. The term “data” as used to representpredetermined information in one physical form shall be deemed toencompass any and all representations of corresponding information in adifferent physical form or forms.

The terms “media data” and “media” as used herein mean data which iswidely accessible, whether over-the-air, or via cable, satellite,network, internetwork (including the Internet), print, displayed,distributed on storage media, or by any other means or technique andthat is humanly perceptible, with or without the aid of a machine ordevice, without regard to the form or content of such data, andincluding but not limited to audio, video, audio/video, text, images,animations, databases, broadcasts, displays (including but not limitedto video displays, posters and billboards), signs, signals, web pages,print media and streaming media data.

The term “research data” as used herein means data comprising (1) dataconcerning usage of media data, (2) data concerning exposure to mediadata, and/or (3) market research data.

The term “presentation data” as used herein means media data, or contentother than media data, to be presented to a user.

The terms “ancillary code” and “code” as used herein means data encodedin, added to, combined with or embedded in media data to provideinformation identifying, describing and/or characterizing the mediadata, and/or other information useful as research data, as well as databased on such data encoded in, added to, combined with or embedded inmedia data.

The terms “reading” and “read” as used herein mean a process orprocesses that serve to recover research data that has been added to,encoded in, combined with or embedded in, media data.

The term “omitted” as used herein in connection with data, means either(1) data not included in a data set produced by reading an ancillarycode, (2) data not recovered with sufficient certainty or probabilityaccording to a predetermined standard to qualify for inclusion in such adata set, or (3) a missing data set that should have been present asindicated by other data. As an example, data is “omitted” when a partialdata set is provided that lacks one or more symbols that should bepresent in the data set. As a further example, data is “omitted” where adevice fails to read any portion of a data set that should have beenpresent in data received by the device as indicated by the presence ofone or more data sets in the received data that were read by the device,by one or more data sets read by one or more other devices or asindicated by data stored in a reference database. As a still furtherexample, data is “omitted” where a device fails to read any portion of adata set that should have been present in data received by the device asindicated by data providing different information that was read by thedevice, the presence of one or more data sets in data received by one ormore other devices or as indicated by data stored in a referencedatabase.

The term “database” as used herein means an organized body of relateddata, regardless of the manner in which the data or the organized bodythereof is represented. For example, the organized body of related datamay be in the form of one or more of a table, a log, a map, a grid, apacket, a datagram, a frame, a file, an e-mail, a message, a document, areport, a list or in any other form.

The term “network” as used herein includes both networks andinternetworks of all kinds, including the Internet, and is not limitedto any particular network or inter-network.

The terms “first”, “second”, “primary” and “secondary” are used todistinguish one element, set, data, object, step, process, function,activity or thing from another, and are not used to designate relativeposition, or arrangement in time or relative importance, unlessotherwise stated explicitly.

The terms “coupled”, “coupled to”, and “coupled with” as used hereineach mean a relationship between or among two or more devices,apparatus, files, circuits, elements, functions, operations, processes,programs, media, components, networks, systems, subsystems, and/ormeans, constituting any one or more of (a) a connection, whether director through one or more other devices, apparatus, files, circuits,elements, functions, operations, processes, programs, media, components,networks, systems, subsystems, or means, (b) a communicationsrelationship, whether direct or through one or more other devices,apparatus, files, circuits, elements, functions, operations, processes,programs, media, components, networks, systems, subsystems, or means,and/or (c) a functional relationship in which the operation of any oneor more devices, apparatus, files, circuits, elements, functions,operations, processes, programs, media, components, networks, systems,subsystems, or means depends, in whole or in part, on the operation ofany one or more others thereof.

The terms “communicate,” and “communicating” and as used herein includeboth conveying data from a source to a destination, and delivering datato a communications medium, system, channel, network, device, wire,cable, fiber, circuit and/or link to be conveyed to a destination andthe term “communication” as used herein means data so conveyed ordelivered. The term “communications” as used herein includes one or moreof a communications medium, system, channel, network, device, wire,cable, fiber, circuit and link.

The term “processor” as used herein means processing devices, apparatus,programs, circuits, components, systems and subsystems, whetherimplemented in hardware, software or both, and whether or notprogrammable. The term “processor” as used herein includes, but is notlimited to one or more computers, hardwired circuits, signal modifyingdevices and systems, devices and machines for controlling systems,central processing units, programmable devices and systems, fieldprogrammable gate arrays, application specific integrated circuits,systems on a chip, systems comprised of discrete elements and/orcircuits, state machines, virtual machines, data processors, processingfacilities and combinations of any of the foregoing.

The terms “storage” and “data storage” as used herein mean one or moredata storage devices, apparatus, programs, circuits, components,systems, subsystems, locations and storage media serving to retain data,whether on a temporary or permanent basis, and to provide such retaineddata.

The terms “panelist,” “panel member,” “respondent” and “participant” areinterchangeably used herein to refer to a person who is, knowingly orunknowingly, participating in a study to gather information, whether byelectronic, survey or other means, about that person's activity.

The term “activity” as used herein includes, but is not limited to,purchasing conduct, shopping habits, viewing habits, computer usage,Internet usage, exposure to media, personal attitudes, awareness,opinions and beliefs, as well as other forms of activity discussedherein.

The term “research device” as used herein shall mean (1) a portable userappliance configured or otherwise enabled to gather, store, processand/or communicate research data, or to cooperate with other devices togather, store, process and/or communicate research data, and/or (2) aresearch data gathering, storing, processing and/or communicatingdevice.

The term “research operation” as used herein means an operationcomprising gathering, processing, storing and/or communicating researchdata.

The term “portable user appliance” (also referred to herein, forconvenience, by the abbreviation “PUA”) as used herein means anelectrical or non-electrical device capable of being carried by or onthe person of a user or capable of being disposed on or in, or held by,a physical object (e.g., attaché, purse) capable of being carried by oron the user, and having at least one function of primary benefit to suchuser, including without limitation, a cellular telephone, a personaldigital assistant (“PDA”), a Blackberry device, a radio, a television, agame system (e.g., a Gameboy® device), a notebook computer, a laptopcomputer, a GPS device, a personal audio device (such as an MP3 playeror an iPod® device), a DVD player, a two-way radio, a personalcommunications device, a telematics device, a remote control device, awireless headset, a wristwatch, a portable data storage device (e.g.,Thumb™ drive), a camera, a recorder, a keyless entry device, a ring, acomb, a pen, a pencil, a notebook, a wallet, a tool, a flashlight, animplement, a pair of glasses, an article of clothing, a belt, a beltbuckle, a fob, an article of jewelry, an ornamental article, a shoe orother foot garment (e.g., sandals), a jacket, and a hat, as well as anydevices combining any of the foregoing or their functions.

Monitors are disclosed that implement an ability to read ancillary codescontained in media or other content as research data. A respective oneof a plurality of such monitors reads ancillary codes comprising suchresearch data to produce an associated data set. On occasion, dataenabling completion of the data set is omitted or the entire data set isomitted, thereby decreasing or eliminating the utility of the data setin a research operation. However, data gathered by one or more others ofthe plurality of monitors and/or data indicating circumstances underwhich such data was gathered, often demonstrates a correspondence withdata gathered by the respective one of the plurality of such monitorsand/or data indicating circumstances under which such data was gathered,so that the data omitted from the data set can be supplied. Also, wherea device fails to read all or part of a first ancillary code that shouldhave been present in data received thereby, the data omitted as a resultof such failure may be inferred where the device successfully readsother ancillary codes present in the received data that carryinformation different from that conveyed by the first ancillary code.Further, in circumstances where such a device fails to read all or partof an ancillary code that should be present in media or other content,it is possible to supply omitted data from a reference database based ondata indicating a correspondence of media or content from which anancillary code was read in part or such ancillary code or data encodedthereby, and either media or content stored in a reference database ordata stored therein identifying such ancillary code or data encodedthereby. Thereby, the desired utility of information represented by thefirst data set can be obtained.

Data of various types enabling an evaluation or determination ofcorrespondence between multiple data sets, each of which is associatedwith a respective portable meter, may be obtained as provided in U.S.Pat. No. 6,845,360 to Jensen et al, issued Jan. 18, 2005; U.S.Provisional Patent Application 60/857,714, filed Nov. 7, 2006; U.S.Non-provisional patent application Ser. No. 10/800,447, filed Mar. 15,2004; U.S. Non-provisional patent application Ser. No. 10/800,883, filedMar. 15, 2004; U.S. Non-provisional patent application Ser. No.11/092,497, filed Mar. 29, 2005; U.S. Non-provisional patent applicationSer. No. 11/643,128, filed Dec. 20, 2006; U.S. Non-provisional patentapplication Ser. No. 11/777,051, filed Jul. 12, 2007; and U.S.Non-provisional patent application Ser. No. 10/093,676, filed Mar. 8,2002. Each of the above patent and patent applications is assigned tothe assignee of the instant application, and are hereby incorporated byreferenced in their entireties. Still further techniques for obtainingvarious types of data for enabling an evaluation or determination ofcorrespondence between multiple data sets, are disclosed herein.

A method of gathering research data is provided. The method comprisesreceiving first data encoded with first research data as a firstancillary code at a first monitoring device; reading the first ancillarycode to provide first research data from which data is omitted;receiving second data encoded with second research data as a secondancillary code at a second monitoring device, reading the secondancillary code to provide the second research data, the second researchdata comprising a data portion corresponding to the omitted data;obtaining correspondence data indicating a correspondence between thefirst research data and the second research data; and augmenting thefirst research data with the data portion of the second research data.

A system for processing research data is provided. The system comprisesan input for receiving first research data first data and provided froma first monitoring device; second research data provided from at leastone second monitoring device, the second research data comprising theomitted first data; and correspondence data indicating a correspondencebetween the first research data and the second research data; and aprocessor coupled with the input to receive the first research data, thesecond research data and the correspondence data, and configured toprocess the received data to augment the partially recovered firstresearch data with the omitted first data.

A method for processing research data gathered by a plurality ofmonitoring devices is provided, the research data comprising messagedata read by the monitoring devices from media data encoded withancillary codes encoding the message data, the message data as read byone or more of the monitoring devices omitting one or more dataportions. The method comprises processing the message data to produce adatabase of corresponding message data; receiving the one or moreomitted data portions from a source other than the one or moremonitoring devices; and processing the corresponding message data andthe one or more data portions to produce complete message dataassociated with the one or more monitoring devices.

A method for processing research data gathered by a monitoring device isprovided, the research data comprising message data read by themonitoring device from media data encoded with an ancillary codeencoding the message data, the message data as read by the monitoringdevice omitting a data portion. The method comprises receiving theomitted data portion from a source other than the monitoring device; andprocessing the message data and the omitted data portion to producecomplete message data including the omitted data portion.

A method for processing research data gathered by a plurality ofmonitoring devices is provided, the research data comprising messagedata read by the monitoring devices from media data encoded withancillary codes encoding the message data. The method comprises for eachof the message data, determining whether it represents an ancillary codeencoded in the media data, and if so, storing an indication that themessage data is valid; processing a plurality of the valid message datato determine portions of the media data that are encoded and portionsthat are unencoded; and storing data in a database indicating portionsof the media data that are encoded.

A method for processing research data gathered by a plurality ofmonitoring devices is provided, the research data comprising messagedata read by the monitoring devices from media data encoded withancillary codes encoding the message data. The method comprisesprocessing a plurality of the message data to determine portions of themedia data that are encoded and portions that are unencoded; and storingencoded portions data in a database indicating portions of the mediadata that are encoded.

A method for processing message data gathered by a plurality ofmonitoring devices is provided, the message data being encoded asancillary codes in media data by at least one encoder and read at leastin part by the monitoring devices from the encoded media data. Themethod comprises receiving media data encoded data produced by the atleast one encoder indicating that the media data is encoded; andprocessing the message data and the media data encoded data to producemedia data exposure and/or usage data.

A method for processing first message data gathered by a monitoringdevice, the message data being read by the monitoring device from mediadata encoded with a first ancillary code encoding the first message dataand included in a media data exposure database of the monitoring device,wherein the monitoring device fails to read the first message data atleast in part, the method comprising: providing a complete copy of thefirst message data based on a message read by at least one othermonitoring device; and augmenting the media data exposure database ofthe monitoring device using the complete copy of the first message data.

A method of processing research data, comprising: providing a first dataset produced by a research data monitor by reading an ancillary codeencoded in media data, the first data set omitting data expectedtherein; providing a second data set comprising data corresponding tothe media data from a source other than the research data monitor; andprocessing the first data set and the second data set to produceprocessed data comprising at least one of: a completed first data setcomprising the data omitted from the first data set; code omission dataindicating that a portion of the media data is unencoded; and furtherdata characterizing the media data in addition to that represented bythe first data set.

A method of detecting a proximity of two portable research data monitorsis provided. The method comprises transmitting a presence message from afirst portable research data monitor; and detecting the presence messagein a second portable research data monitor.

A system for detecting a proximity of two portable research datamonitors is provided. The system comprises a first research data monitorcomprising a first short range transmitter operative to transmit a firstpresence message indicating a presence of the first research datamonitor; and a second research data monitor comprising a receiveroperative to receive the first presence message.

A method of synchronizing widely dispersed devices in a research datagathering system is provided. The method comprises receiving widelyavailable timing data from a source external to the research datagathering system in each of a plurality of research data gatheringdevices located remotely from one another, adjusting internally producedtiming data in each of the plurality of research data gathering devicesbased on the widely available timing data, receiving the widelyavailable timing data at a processing facility of the research datagathering system, and adjusting system timing data of the processingfacility based on the widely available timing data.

A research data gathering system is provided. The research datagathering system comprises a plurality of research data gatheringdevices located remotely from one another, each of the research datagathering devices comprising an internal clock operative to produceinternal clock data, an input coupled to receive widely available timingdata from a source external to the research data gathering system and aprocessor coupled with the internal clock and the input to receive theinternal clock data and the widely available timing data and configuredto adjust the internal clock data based on the widely available timingdata. The system further comprises a processing facility configured toprocess research data gathered by the plurality of research datagathering devices and comprising a system clock operative to producesystem clock data for the research data gathering system, an inputcoupled to receive the widely available timing data and a processorcoupled with the internal clock and the input to receive the systemclock data and the widely available timing data and configured to adjustthe system clock data based on the widely available timing data.

A research data gathering system is provided. The research datagathering system comprises a plurality of research data gatheringdevices located remotely from one another and a processing facilityconfigured to process research data gathered by the plurality ofresearch data gathering devices, each of the research data gatheringdevices and the processing facility comprising an input coupled toreceive widely available timing data from a source external to theresearch data gathering system and a processor configured to produceclock data based on the widely available timing data.

DETAILED DESCRIPTION OF THE INVENTION

The disclosed methods and systems, as well as particular features andadvantages of various embodiments thereof will become more apparent fromthe following detailed description considered with reference to theaccompanying drawings in which the same elements depicted in differentdrawing figures are assigned the same reference numerals.

FIGS. 1A and 1B illustrate instances of reception of data encoded withan ancillary code encoding research data, such as encoded media, inmonitoring devices M1 and M2. In certain ones of such instances, themonitoring devices M1 and M2 comprise portable monitoring devices. Incertain ones of such instances, the monitoring devices M1 and M2comprise stationary monitoring devices. In certain ones of suchinstances, one of the monitoring devices M1 and M2 comprises astationary monitoring device, while the other thereof comprises aportable monitoring device. In FIG. 1A, a source of encoded data “A” isreceived by monitor M1, and a source of encoded data “B” is received bymonitor M2. In FIG. 1B, a source of encoded data “C” is commonlyreceived by monitors M1 and M2, for example, where monitors M1 and M2are located in the same room or in the presence of a common source ofmedia data or content, such as a television, radio, audio system, videogame, or at a theater, so that both receive data “C”. In each of FIGS.1A and 1B, each of the monitors M1 and M2 attempts to read ancillarycodes encoded in a respective one of the sources of encoded data “A”,“B”, or “C” to produce the research data therefrom. The producedresearch data comprises a Data Set 1 and a Data Set 2, producedrespectively by monitors M1 and M2, and which are shown, for example, inFIG. 1B.

Each of the monitors M1 and M2 is coupled to a source of encoded data bya wired coupling, or, a wireless coupling comprising an acoustic medium,a Bluetooth™ protocol, a ZigBee™ protocol, an inductive link, acapacitive link, an RF link, infrared link, a link provided by visiblelight (e.g., to convey a image or video data) or otherwise.

During the attempted collection of Data Set 1, for example, situationsand/or circumstances may arise which cause collection of data, andparticularly Data Set 1, to be incomplete or even missing in itsentirety. Such situations and circumstances can, for instance, comprisea dropout in a communications channel, or excessive noise in such achannel, or inaccurate recording, or equipment/technical failure. Forinstance, where the ambient acoustic medium is used to couple encodedsound data to a microphone of a monitoring device, noise sources such asconversations, dogs barking, babies crying, appliance noises, and windand engine noise (in an automobile, for example) can interfere withcomplete reading of an ancillary code by the monitoring device.

Such an incomplete collection of data resulting in Data Set 1 output bymonitor M1 may resemble the exemplary set of data illustrated in FIG. 2Aat “a”. Therein, there is illustrated a grouping of numeralsrepresenting elements of the Data Set 1 wherein expected data, forexample in the form of the numeral “6”, is omitted because of, forexample, any of the aforementioned situations and/or circumstancesdiscussed above. With respect to the type of data gathered andrepresented as Data Set 1 and as shown at “a”, it is to be understoodthat Data Set 1 may comprise, for example, various data, whether orderedor unordered, whether apparently logical or illogical, and whetheranticipated or unanticipated in any regard.

Data Set 2 output by monitor M2 is represented at “b”. Upon inspection,it will be seen that Data Set 2 includes elements that correspond to theelements included in the incomplete Data Set 1, and so may correspond toData Set 1 had it been read in its entirety. Correspondence data “bb” isemployed to establish a likelihood that Data Set 1 corresponds to DataSet 2, based on which the element omitted from Data Set 1, representedat “a” by “_” is determined, and is provided to augment the Data Set 1now comprising numerals “1-6′” so that Data Set 1 includes all expectedelements. Herein, the prime “′” appended to the numeral “6” representsthat its source is Data Set 2. Even where Data Set 1 is absent in itsentirety from the data read by monitor M1, based on the correspondencedata “bb”, Data Set 2 may be used to augment the data read by monitor M1with a copy of Data Set 2. Accordingly, the expected utility of the datagathered by portable meter M1 can be obtained.

FIG. 2B illustrates a scenario in which multiple elements are omittedfrom Data Set 1, as shown at “a1”. The omitted data may take any formwhich renders Data Set 1 to be incomplete, and moreover, incomplete inways not shown in FIG. 2B. Data Set 2, as shown at “b1”, is a completedata set for which correspondence data “bb1” enables a determinationthat Data Set 2 corresponds to Data Set 1. Based on this determination,complete Data Set 1, as shown at “c1”, is produced by augmenting theincomplete Data Set 1 illustrated at a1, wherein the prime “′” symbol isused to represent that the indicated symbols are supplied from Data Set2. Even where Data Set 1 is absent in its entirety from the data read bymonitor M1, based on the correspondence data “bb1”, Data Set 2 may beused to augment the data read by monitor M1 with a copy of Data Set 2.

It is to be understood that correspondence data is data, or arepresentation thereof, which is useable to infer correspondence betweenan incomplete data set, as in the case of Data Set 1 or even acompletely absent Data Set 1, and an otherwise complete data set, as inthe case of Data Set 2. Such correspondence data may comprise, forexample, time and/or date of collection of Data Set 1 and Data Set 2,the location or locations of monitors M1 and M2 where they received theencoded data read as Data Sets 1 and 2, relative locations of monitorsM1 and M2 (such as in-home, out-of-home, at work, at a certaincommercial establishment, or in a vehicle, or proximity of the monitorsM1 and M2 to each other), the contents of Data Sets 1 and 2, one or moredata sets obtained by reading other ancillary codes accompanying thosefrom which Data Sets 1 and 2 were produced. In certain embodiments,where the correspondence data demonstrates a high probability that twomonitors received the same media, a data set from one of the monitorsmay be used to augment an incomplete data set of the other, or even toprovide a data set for inclusion in a record of the other monitor whereit completely fails to read an ancillary code. Such correspondence datacan comprise data indicating that the two monitors were at the samelocation (such as a room in a dwelling or at the same theater) at thesame time or time period, or that the two monitors were in closeproximity to each other (such as data obtained by a short range wirelesstransmission from one monitor to the other, or data collected by a thirdmonitoring device detecting that both monitors were in close proximity).

In certain embodiments, if N monitors read ancillary codes from mediasupplied via the same media network, station or channel, to produce thesame N complete data sets each of which also comprises the same contentas Data Set 1 (although Data Set 1 is incomplete or absent), and thetimes at which all such data sets are produced (or ancillary codes areread) correspond, it is determined that Data Set 1 is the same as the Ncomplete data sets, and Data Set 1 is augmented with the missing datafrom the corresponding complete data set. Here, N is a natural numbergreater than or equal to 1. N is statistically established as a numberof monitoring devices having read the complete message data, which issufficiently large to satisfy a predetermined probability that themessage data were correctly read by the plurality of monitoring devices.Statistical methods for determining a probability that an event hasoccurred based on a number of detections of such an event are well knownin the art, and so, need not be disclosed in greater detail herein. Asnoted above, in appropriate circumstances, N may be selected as 1,particularly where correspondence data provides a sufficiently highprobability that a single monitoring device having read the completemessage data received the same media as the monitor that produced DataSet 1.

In certain further embodiments, where monitor M1 partially reads anexemplary ancillary code 123X (where “X” represents one or more unreadcode symbols) at a time T1 or within a time interval T1′ and alsorecords exposure to network, station and/or channel Y at T1 or T1′, anda different monitor M78 partially reads the exemplary ancillary code123X at the same time T1 or time interval T1′ without also recordingexposure to the same network, station or channel Y at T1 or T1′, and atleast N still other monitors read complete exemplary codes 123 . . . atthe same time or time interval while exposed to the same network,station or channel, the partial codes read by monitors M1 and M78 areaugmented to correspond to the complete codes read by the N monitors andit is deemed that monitor 78 was also exposed to network, station orchannel Y at time T1 or time T1′. Again, N is a natural number greaterthan or equal to 1. In certain additional embodiments, under the sameconditions, it is not deemed that monitor 78 was also exposed tonetwork, station or channel Y at time T1 or time T1′, but rather someother, unidentified source. In still further embodiments, where monitorM1 partially reads an exemplary ancillary code 123X (where “X”represents one or more unread code symbols) at a time T1 or within atime interval T1′ but without recording exposure to a network, stationor channel, and at least N other monitors read the complete exemplaryancillary code 123 . . . at the same time T1 or time interval T1′,without recording exposure to a network, station or channel, the partialcode read by monitor M1 is augmented to correspond to the complete codesread by the N monitors, and it is deemed that monitor M1 was exposed toan unidentified network, station or channel. N is statisticallyestablished as a number of monitoring devices having read the completeexemplary ancillary code 123 . . . at the same time T1 or time intervalT1′, without recording exposure to a network, station or channel, whichis sufficiently large to satisfy a predetermined probability that thedata received by the monitors did not include an ancillary codeidentifying a network, station or channel. Statistical methods fordetermining a probability that an event has occurred based on a numberof detections of such an event are well known in the art, and so, neednot be disclosed in greater detail herein. Of course, where it issufficiently probable that a given monitor has received the same encodedmedia as another monitor that failed to read one or more codes therein,N may be selected as 1.

While the exemplary ancillary codes in the various embodiments andexamples disclosed herein have been represented as sequences of numbers,in practice the ancillary codes may represent or include any combinationof symbols, such as letters, numerals (whether decimal, binary,hexadecimal or other form), other kinds of symbols, or combinations ofthe foregoing, and may be either an ordered set of symbols or anunordered set of symbols. Moreover, the ancillary code may include anynumber of symbols and the symbols may be encoded in media data using anyencoding technique.

FIG. 2C is a diagram illustrating certain embodiments of a research datagathering system 21 for processing research data. System 21 comprises aninput 23 for receiving monitored data comprising partially recoveredfirst research data such as Data Set 1, and second research datacomprising the expected data, such as Data Set 2. Device 21 furtherreceives correspondence data, such as data “bb” or “bb1”. Each of thedata is received and processed by a processor 25 to enable augmentationof the partially recovered first research data with the expected data.

Storage device 27, coupled to processor 25, receives data from theprocessor 25 for storage. Communications 29 is coupled with theprocessor 25 and is provided for communicating processed data such asthat shown at “c” and “c1” in FIGS. 2A and 2B, respectively, to afurther processor or file server for further processing and/or storage,to a display for presentation to a user, or, to a processing facilityfor producing research data reports using the augmented first researchdata.

It is to be understood that input 23 may, for example, comprise either anetwork interface card, modem, wireless network card, transceiver, harddrive, manual input device such as a keyboard or mouse, or any othertype of device useful for receiving data.

In certain embodiments of the research data gathering system 21, firstmessages read by one or more monitoring devices but which omit dataportions or even complete messages, are received by the system 21 viainput 23 or communications 29. For example, where the first messagescomprise data sets that are expected to include one or more elementsthat have been omitted, the data sets may be sets of ordered data ordata for which no order is prescribed. In certain ones of suchembodiments, second messages read by further monitoring devices are alsoreceived by system 21 through input 23 or communications 29. The secondmessages, however, comprise complete data sets. The processor 25processes the first and second messages to determine which appear tomatch. For example, processor 25 may determine that a match of one ofthe first messages and one or more of the second messages exists (a)where all of the elements of such first message correspond to elementsof the one or more second messages, (b) where all of the elements of thefirst message correspond to elements of the one or more second messagesand are ordered in the same manner, and/or (c) where fewer than allelements of the first data set correspond to elements of the one or moresecond messages, but the number of elements of the first set which donot thus correspond is no greater than a predetermined natural number.One possible, but not necessary, criterion for matching in case (c) maybe that the elements of the first message that do not correspond beassociated with data indicating a reduced likelihood that such elementswere read correctly. In certain ones of these embodiments, where atleast N (where N is a natural number) of the one or more second messagesmatch the first message, processor 25 determines that these messagescorrespond and either adds to the first message such element or elementsof the matching second message or messages omitted from the firstmessage or produces a new data set corresponding to a complete message,and stores such augmented first message or such new data set in storage27 in association with data identifying the source of the first message(e.g., a monitor, panelist and/or household identification). N isstatistically established as a number of matching messages, which issufficiently large to satisfy a predetermined probability that the firstmessage data was read correctly by its corresponding monitor.Statistical methods for determining a probability that an event hasoccurred based on a number of detections of such an event are well knownin the art, and so, need not be disclosed in greater detail herein.Corresponding processes are carried out for other received data whichomit expected data. After the messages have been augmented as explainedabove and stored in storage 27, they are retrieved by processor 25 whicheither (a) produces reports of media data exposure by processing theretrieved data, or processes the retrieved data preliminary topreparation of such reports, or (b) communicates the retrieved data toanother processor via communications 29 for preparation of such reportsor further processing preliminary to such preparation.

In certain embodiments, rather than match the first message against oneor more of the second messages, processor 25 retrieves one or more datasets from storage 27 that represent messages determined to be valid andattempts to match the first message therewith. If a match of the firstmessage with one or more such retrieved messages is found by processor25, for example, using one or more of the criteria set forthhereinabove, the processor 25 determines that these messages correspondand either adds to the first message such element or elements of thematching retrieved message or messages omitted from the first message orproduces a new data set corresponding to a complete message, and storessuch augmented first message or such new data set in storage 27 inassociation with data identifying the source of the first message.Corresponding processes are carried out for other received data whichomit expected data.

In certain embodiments, the first message and either or both of thesecond messages and retrieved messages are associated with additionaldata useful in establishing a match. In addition to matching the firstmessage with other messages that are complete or are determined to bevalid, processor 25 processes such further data in determining whetherthe messages match. In certain ones of such embodiments, time dataindicating times when or time intervals in which the various messageswere read or gathered are associated with the first message and thesecond message or messages, and/or the retrieved messages, and such timedata are compared by processor 25 to determine if it is likely themessages correspond. If one or more matching messages and times arefound by processor 25, in certain embodiments it determines that themessages correspond. A further criterion employed in certain ones ofthese embodiments is that at least N such matching messages or matchingmessages from N monitors be found in order to determine a match, where Nis a natural number greater than or equal to 1. N is statisticallyestablished as a number of matching messages determined to be valid ormatching messages from N monitors having read or gathered the completemessage data at corresponding times or time intervals, which issufficiently large to satisfy a predetermined probability that the firstmessage data was correctly read by its corresponding monitoring device.Statistical methods for determining a probability that an event hasoccurred based on a number of detections of such an event are well knownin the art, and so, need not be disclosed in greater detail herein.

In certain ones of such embodiments, location data indicating placeswhere the various messages were read or gathered, or relative locationswhere such messages were read or gathered (such as in-home, out-of-home,at work, at a certain commercial establishment, or in a vehicle, orproximity of two or more monitors to each other) are associated with thefirst message and either or both of the second message or messagesand/or retrieved messages and such location data are compared byprocessor 25 to determine if it is likely the messages correspond. Ifone or more matching messages are found by processor 25 to have beenread or gathered in corresponding locations, in certain embodiments itdetermines that the messages correspond. Where the correspondence data,apart from any matching codes, provides a sufficient probability thatthe same codes should have been read by two or monitors, codes omittedin the data or one or more such monitors are supplemented using codesread by one or more others of such monitors and/or using data from areference database in storage 27.

Where the monitoring devices are arranged to read multiple ancillarycodes each including a message that conveys different information, incertain embodiments processor 25 makes use of such messages read by themonitor that read the first message, along with any such messages readby the monitor or monitors which read the second message, or any suchmessages associated with the retrieved message or messages, to determinea match. As an example, where the various monitors are arranged to readmultiple ancillary codes simultaneously present in media data from whichthe first and second messages were read, the first and second messagesencoded as a first ancillary code might include data indicating theidentity of a program, commercial, promotion or public serviceannouncement, while separate ancillary codes may encode a networkidentification message and/or a station or channel identificationmessage. Techniques for encoding and decoding such multiple messages aredisclosed in U.S. Pat. No. 6,845,360 B2 to Jensen et al., incorporatedherein by reference. If one or more matching messages and correspondingadditional messages are found by processor 25, in certain embodiments itdetermines that the matching messages correspond. A further criterionemployed in certain ones of these embodiments is that at least N suchmatching messages or matching messages from N monitors be found inaddition to either corresponding location data or correspondingadditional messages, in order to determine a match, where N is a naturalnumber greater than or equal to 1. N is statistically established as anumber of matching messages determined to be valid or matching messagesfrom N monitors having read or gathered the complete message data atcorresponding locations or with corresponding additional messages, whichis sufficiently large to satisfy a predetermined probability that thefirst message data was correctly read by its corresponding monitoringdevice. Statistical methods for determining a probability that an eventhas occurred based on a number of detections of such an event are wellknown in the art, and so, need not be disclosed in greater detailherein.

In certain embodiments of the research data gathering system 21,messages read by one or more monitoring devices, are received by thesystem 21 via input 23 or communications 29. In certain ones of suchembodiments, the received messages are complete messages (readcompletely or augmented by means of other data), while in others thereceived messages omit expected data, and in still others, both completeand incomplete messages are received by system 21. In such embodiments,the received messages are processed by processor 25 to determine if theyare valid. In certain ones of such embodiments, processor 25 carries outa matching process to determine whether the received messages match withothers of the received messages, and/or with messages retrieved fromstorage 27. In certain ones of such embodiments, processor 25 applies acriterion that, to determine whether a given received message is validit must match at least N other received messages and/or retrievedmessages, where N is a natural number greater than or equal to 1 andwhich is sufficiently large to satisfy a predetermined probability thatthe received message data was read correctly by its correspondingmonitor. The matching criteria described hereinabove for augmentingincomplete messages may also be employed in the presently describedprocess of matching messages to validate them.

In still further embodiments, additional data is employed by processor25 to determine whether the received message data are valid, includingone or more of time data associated with the received messages, locationdata associated therewith and additional messages that convey differentinformation and obtained by reading ancillary codes in the media data inaddition to the ancillary code read as the received message data. Suchdata may be processed by processor 25 in the same manner as such data isprocessed to augment incomplete message data, as described hereinabove.

In certain embodiments of the research data gathering system 21,messages read by one or more monitoring devices, are received by thesystem 21 via input 23 or communications 29. In certain ones of suchembodiments, the received messages are complete messages (readcompletely or augmented by means of other data), while in others thereceived messages omit expected data, and in still others, both completeand incomplete messages are received by system 21. In such embodiments,the received messages are processed by processor 25 to determine whichportions of media data received by the monitoring devices that read suchmessages, were encoded, and processor 25 stores encoded portions data instorage 27 representing such portions in association with one or moreidentifiers for such media data. In addition or in the alternative,processor 25 stores data indicating which portions of the media datawere unencoded, or data indicating which portions were encoded as wellas which were not encoded.

The encoded portions data with or without data indicating which portionsof the media data were unencoded, is particularly useful in producingaverage minute ratings for media data (such as television programs),since it enables processing of the received message data identifying aparticular program or other content using only the encoded portions ofthe media data. For example, if a program has a duration of one-halfhour, but is only encoded during 27 minutes of such half hour, averageminute ratings for the program will be produced based only on theencoded 27 minutes, rather than the full half hour duration.

In certain embodiments, processor 25 determines which portions of mediadata are encoded based on messages read by monitors exposed to suchmedia data which are received by input 23 or communications 29. Morespecifically, for each of multiple time segments of the media data(e.g., one-minute intervals), processor 25 counts the number ofcorresponding valid messages received by system 21. If, for a given timesegment, at least N valid messages were so received, processor 25determines that such time segment was encoded and stores data indicatingthis event in storage 27 in association with data identifying the timesegments and the media data. N is a natural number which isstatistically established as a number which is sufficiently large tosatisfy a predetermined probability that the media data was encodedduring the time segment being processed.

In certain embodiments of the research data gathering system 21,messages read by one or more monitoring devices, are received by thesystem 21 via input 23 or communications 29. In certain ones of suchembodiments, the received messages are complete messages (readcompletely or augmented by means of other data), while in others thereceived messages omit expected data, and in still others, both completeand incomplete messages are received by system 21. The system 21 alsoreceives data produced by one or more media data encoders identifyingmedia data that was encoded thereby, along with time or time interval ofencoding data indicating when such encoding was performed. Afterprocessing of the received messages by processor 25 to complete messagesomitting expected data and validating such messages that qualify forvalidation, processor 25 either produces media exposure data based onthe complete and validated messages as well as the data received fromthe encoder or encoders, or communicates such data to a differentprocessor for producing such media exposure data. In certain ones ofsuch embodiments, processor 25 or another processor produces averageminute ratings for media data based on the complete and validatedmessages as well as the data received from the encoder or encoders.

The description provided hereinbelow provides disclosures of variousembodiments of monitors, such as monitors M1 and M2, for readingancillary codes contained in the media received thereby.

FIG. 3 is a diagram illustrating certain embodiments of a research datamonitor 10. An input device 12 is provided for receiving monitored data.The input device 12 can comprise either a single device or multipledevices, stationary at a source to be monitored, or multiple devices,stationary at multiple sources to be monitored. Alternatively, the inputdevice 12 can be incorporated in a portable monitoring device that canbe carried by an individual to monitor various sources as the individualmoves about.

Where acoustic data including media data, such as audio data, ismonitored, the input device 12 typically would be an acoustic transducersuch as a microphone, having an input which receives media data in theform of acoustic energy and which serves to transduce the acousticenergy to electrical data. Where media data in the form of light energy,such as video data, is monitored, the input device 12 takes the form ofa light-sensitive device, such as a photodiode, or a video camera. Lightenergy including media data could be, for example, light emitted by avideo display. The device 12 can also take the form of a magnetic pickupfor sensing magnetic fields associated with a speaker, a capacitivepickup for sensing electric fields or an antenna for electromagneticenergy. In still other embodiments, the device 12 takes the form of anelectrical connection to a monitored device, which may be a television,a radio, a cable converter, a satellite television system, a gameplaying system, a VCR, a DVD player, a portable player, a computer, aweb appliance, or the like. In still further embodiments, the inputdevice 12 is embodied in monitoring software running on a computer togather media data.

A processor 14, coupled to the input device 12, is provided forprocessing the monitored data. Storage device 16, coupled to processor14, receives data from the processor 14 for storage. Communications 18is coupled with the processor 14 and is provided for communicating theprocessed data to a processing facility for use in preparing reportsincluding research data.

FIG. 3A is a diagram for use in explaining operation of certainembodiments of the system of FIG. 3. As shown at 20, time-domain audiodata is received by the input device 12. Once received, the time-domainaudio data, representing the audio signal as it varies over time, isconverted by processor, as shown at 22, to frequency-domain audio data,i.e., data representing the audio signal as it varies with frequency. Aswill be understood by one of ordinary skill in the art, conversion fromthe time domain to the frequency domain may be accomplished by any oneof a number of existing techniques comprising, for instance, discreteFourier transform, fast Fourier transform (FFT), DCT, wavelet transform,Hadamard transform or other time-to-frequency domain transformation, orelse by digital or analog filtering. Processor 14 stores thefrequency-domain audio data temporarily in storage 16 with or without atime stamp recoding the time at which the ancillary code was read.

Processor 14 processes the frequency-domain audio data to read anancillary code therein to produce a data set for use in identifying theaudio signal or obtaining other information concerning the audio signal(such as a source or distribution path thereof), and stores the data setin storage 16 with or without a time stamp recording the time at whichthe ancillary code was read.

Where audio media includes ancillary codes, suitable decoding techniquesare employed to detect the encoded information, such as those disclosedin U.S. Pat. No. 5,450,490 and U.S. Pat. No. 5,764,763 to Jensen, etal., U.S. Pat. No. 5,579,124 to Aijala, et al., U.S. Pat. Nos.5,574,962, 5,581,800 and 5,787,334 to Fardeau, et al., U.S. Pat. No.6,871,180 to Neuhauser, et al., U.S. Pat. No. 6,862,355 to Kolessar, etal., U.S. Pat. No. 6,845,360 to Jensen, et al., U.S. Pat. No. 5,319,735to Preuss et al., U.S. Pat. No. 5,687,191 to Lee, et al., U.S. Pat. No.6,175,627 to Petrovich et al., U.S. Pat. No. 5,828,325 to Wolosewicz etal., U.S. Pat. No. 6,154,484 to Lee et al., U.S. Pat. No. 5,945,932 toSmith et al., US 2001/0053190 to Srinivasan, US 2003/0110485 to Lu, etal., U.S. Pat. No. 5,737,025 to Dougherty, et al., US 2004/0170381 toSrinivasan, and WO 06/14362 to Srinivasan, et al., all of which herebyare incorporated by reference herein.

Examples of techniques for encoding ancillary codes in audio, and forreading such codes, are provided in Bender, et al., “Techniques for DataHiding”, IBM Systems Journal, Vol. 35, Nos. 3 & 4, 1996, which isincorporated herein by reference in its entirety. Bender, et al.disclose a technique for encoding audio termed “phase encoding” in whichsegments of the audio are transformed to the frequency domain, forexample, by a discrete Fourier transform (DFT), so that phase data isproduced for each segment. Then the phase data is modified to encode acode symbol, such as one bit. Processing of the phase encoded audio toread the code is carried out by synchronizing with the data sequence,and detecting the phase encoded data using the known values of thesegment length, the DFT points and the data interval.

Bender, et al. also describe spread spectrum encoding and decoding, ofwhich multiple embodiments are disclosed in the above-cited Aijala, etal. U.S. Pat. No. 5,579,124.

Still another audio encoding and decoding technique described by Bender,et al. is echo data hiding in which data is embedded in a host audiosignal by introducing an echo. Symbol states are represented by thevalues of the echo delays, and they are read by any appropriateprocessing that serves to evaluate the lengths and/or presence of theencoded delays.

A further technique, or category of techniques, termed “amplitudemodulation” is described in R. Walker, “Audio Watermarking”, BBCResearch and Development, 2004. In this category fall techniques thatmodify the envelope of the audio signal, for example by notching orotherwise modifying brief portions of the signal, or by subjecting theenvelope to longer term modifications. Processing the audio to read thecode can be achieved by detecting the transitions representing a notchor other modifications, or by accumulation or integration over a timeperiod comparable to the duration of an encoded symbol, or by anothersuitable technique.

Another category of techniques identified by Walker involvestransforming the audio from the time domain to some transform domain,such as a frequency domain, and then encoding by adding data orotherwise modifying the transformed audio. The domain transformation canbe carried out by a Fourier, DCT, Hadamard, Wavelet or othertransformation, or by digital or analog filtering. Encoding can beachieved by adding a modulated carrier or other data (such as noise,noise-like data or other symbols in the transform domain) or bymodifying the transformed audio, such as by notching or altering one ormore frequency bands, bins or combinations of bins, or by combiningthese methods. Still other related techniques modify the frequencydistribution of the audio data in the transform domain to encode.Psychoacoustic masking can be employed to render the codes inaudible orto reduce their prominence. Processing to read ancillary codes in audiodata encoded by techniques within this category typically involvestransforming the encoded audio to the transform domain and detecting theadditions or other modifications representing the codes.

A still further category of techniques identified by Walker involvesmodifying audio data encoded for compression (whether lossy or lossless)or other purpose, such as audio data encoded in an MP3 format or otherMPEG audio format, AC-3, DTS, ATRAC, WMA, RealAudio, Ogg Vorbis, APTX100, FLAC, Shorten, Monkey's Audio, or other. Encoding involvesmodifications to the encoded audio data, such as modifications to codingcoefficients and/or to predefined decision thresholds. Processing theaudio to read the code is carried out by detecting such modificationsusing knowledge of predefined audio encoding parameters.

It will be appreciated that various known encoding techniques may beemployed, either alone or in combination with the above-describedtechniques. Such known encoding techniques include, but are not limitedto FSK, PSK (such as BPSK), amplitude modulation, frequency modulationand phase modulation.

In certain embodiments, certain encoding techniques, such as thosedescribed in U.S. Pat. No. 6,871,180 to Neuhauser, et al., discloseaudio encoding techniques that encode audio with one or morecontinuously repeating messages, each including a number of code symbolsfollowing one after the other along a timebase of the audio signal. Eachcode symbol comprises a plurality of frequency components. In certainembodiments of system 10 that are adapted to read continuously repeatingmessages, acoustic energy, or, sound, picked up by the input device 12is continuously monitored to detect the embedded symbols comprising anencoded message. That is, decoding of an encoded message in the audiosignal occurs continuously throughout operation of the system 10. Indoing so, system 10 performs an FFT by means of processor 14 which iscarried out on a continuing basis transforming a time segment of theaudio signal to the frequency domain. In certain ones of suchembodiments, a segment thereof comprising a one-quarter second durationis transformed to the frequency domain using an FFT, such that thesegments overlap by, for example, 40%, 50%, 60%, 70% or 80%. System 10separately evaluates for each component of the frequency code symbols inthe encoded message whether the received energy comprises either amessage or noise first by formulating a quotient comprising anassociated energy value of a given frequency bin that would indicatesuch frequency components relative to a noise level associated withneighboring frequency bins. The noise level is obtained by averaging theenergy levels of a predetermined number of frequency ranges neighboringthe selected frequency bin being evaluated.

Storage 16 implements one or more accumulators for storage of thequotients associated with varying portions of the audio signal. Storage16, for instance comprising a first-in/first-out (FIFO) buffer, enableseach of the quotients to be continuously, repeatedly accumulated andsorted according to predetermined criteria. Such criteria comprises,optionally, a message length equal to that of the accumulator.Accordingly, where there are multiple messages simultaneously present inthe audio, each accumulator serves to accumulate the frequencycomponents of the code symbols in a respective one of the messages. Incertain ones of these embodiments, multiple messages are detected asdisclosed in U.S. Pat. No. 6,845,360 to Jensen, et al. Accumulation ofthe messages in this manner comprises an advantage of reducing theinfluence of noise which factors into the reading of the message.

With reference to FIG. 4, which illustrates at least one of certainadvantageous embodiments of the system, a PUA 27 is shown which isconfigured for gathering research data. Audio data is received at themicrophone 28, which may also comprise a peripheral of the PUA 27allowing it to be located a distance from the remainder thereof shoulddoing so provide added convenience to the user. The audio data is thenconditioned and converted from its analog format to digital data, asshown at 30, in a manner understood by one of ordinary skill in the art.A programmable processor 32 coupled with the system then transforms thedigital data to the frequency domain, optionally by DFT, FFT or othertransform technique including DCT, wavelet transform, Hadamardtransform, or else by digital or analog filtering. The PUA 27 furthercomprises storage 34, comprising a buffer such as a FIFO bufferaddressed herein, for cooperation with the processor 32 in a manner wellunderstood by one of ordinary skill in the art, to decode an ancillarycode from the single data set produced by, for example, an FFT.Communications 36 receives data processed by the processor 32 and iscoupled thereto for delivery to a remote processing location. In certainembodiments, storage 34 serves to retain information not immediatelytransmitted to communications 36.

With reference to FIGS. 5 and 5A, there is illustrated a block diagramof a cellular telephone 38 modified to carry out a research operation.The cellular telephone 38 comprises a processor 40 operative to exerciseoverall control of the cellular telephone's operation and to processaudio and other data for transmission or reception. Communications 50 iscoupled to the processor 40 and is operative to establish and maintain atwo-way wireless communication link with a respective cell of a cellulartelephone network. In certain embodiments, processor 40 is configured toexecute applications apart from or in conjunction with the conduct ofcellular telephone communications, such as applications serving todownload audio and/or video data to be reproduced by the cellulartelephone, e-mail clients and applications enabling the user to playgames using the cellular telephone. In certain embodiments, processor 40comprises two or more processing devices, such as a first processingdevice (such as a digital signal processor) that processes audio, and asecond processing device that exercises overall control over operationof the cellular telephone. In certain embodiments, processor 40comprises a single processing device. In certain embodiments, some orall of the functions of processor are implemented by hardwiredcircuitry.

Cellular telephone 38 further comprises storage 60 coupled withprocessor 40 and operative to store data as needed. In certainembodiments, storage 60 comprises a single storage device, while inothers it comprises multiple storage devices. In certain embodiments, asingle device implements certain functions of both processor 40 andstorage 60.

In addition, cellular telephone 38 comprises a microphone 100 coupledwith processor 40 and serving to transduce the user's voice to anelectrical signal which it supplies to processor 40 for encoding, and aspeaker and/or earphone 70 coupled with processor 40 to transducereceived audio from processor 40 to an acoustic output to be heard bythe user. Cellular telephone 38 also includes a user input 80 coupledwith processor 40, such as a keypad, to enter telephone numbers andother control data, as well as a display 90 coupled with processor 40 toprovide data visually to the user under the control of processor 40.

In certain embodiments, cellular telephone 38 provides additionalfunctions and/or comprises additional elements. In certain ones of suchembodiments, the cellular telephone 38 provides e-mail, text messagingand/or web access through its wireless communications capabilities,providing access to media and other content. For example, Internetaccess via cellular telephone 38 enables access to video and/or audiocontent that can be reproduced by the cellular telephone 38 for theuser, such as songs, video on demand, video clips and streaming media.In certain embodiments, storage 60 stores software providing audioand/or video downloading and reproducing functionality, such as iPod®software, enabling the user to reproduce audio and/or video contentdownloaded from a source, such as a personal computer via communications50 or through direct Internet access via communications 50.

To enable cellular telephone 38 to gather research data, namely, dataindicating exposure to audio such as programs, music and advertisements,research software is installed therein or downloaded thereto to controlprocessor 40 to gather such data and communicate it via communications50 to a research organization. The research software in certainembodiments also controls processor 40 to store the data in storage 60for subsequent communication. The research software may be installed inthe cellular telephone at the time of manufacture, such as in anon-volatile memory device, or downloaded to it subsequently by theresearch organization, by a third party such as a service provider, orby the panelist.

The research software controls the processor 40 to transduce thetime-domain audio data produced by microphone 100 to frequency domaindata and to read ancillary codes from the frequency domain data usingone or more of the known techniques identified hereinabove, and then tostore and/or communicate the codes that have been read for use asresearch data indicating encoded audio to which the user was exposed. Incertain embodiments, the research software controls the processor 40 tostore samples of the transduced audio, either in compressed oruncompressed form for subsequent processing to read ancillary codestherein after transformation to the frequency domain.

Where the cellular telephone 38 possesses functionality to downloadand/or reproduce media data and/or other content for use as presentationdata, in certain embodiments, research data concerning the usage and/orexposure to such media data and/or other content as well as audio datareceived acoustically by microphone 100, is gathered by cellulartelephone 38 in accordance with the technique illustrated by thefunctional block diagram of FIG. 5A. Storage 60 of FIG. 5 implements anaudio buffer 110 for audio data gathered with the use of microphone 100.In certain ones of these embodiments storage 60 implements a buffer 130for data downloaded and/or reproduced by cellular telephone 38 to whichthe user is exposed via speaker and/or earphone 70 or display 90, or bymeans of a device coupled with cellular telephone 38 to receive the datatherefrom to present it to a user. In some of such embodiments, thereproduced data is obtained from downloaded data, such as songs, webpages or audio/video data (e.g., movies, television programs, videoclips). In some of such embodiments, the reproduced data is providedfrom a device such as a broadcast or satellite radio receiver of thecellular telephone 38 (not shown for purposes of simplicity andclarity). In certain ones of these embodiments storage 60 implements abuffer 130 for metadata of media data and/or content reproduced orreceived by cellular telephone 38 to which the user is exposed viaspeaker and/or earphone 70 or display 90, or by means of a devicecoupled with cellular telephone 38 to receive the data therefrom topresent it to a user. Such metadata can be, for example, a URL fromwhich the media data and/or other content was obtained, channel tuningdata, program identification data, an identification of a prerecordedfile from which the data was reproduced, or any data that identifiesand/or characterizes the media data and/or other content, or a sourcethereof. Where buffer 130 stores audio data, buffers 110 and 130 storetheir audio data (either in the time domain or the frequency domain)independently of one another. Where buffer 130 stores metadata of audiodata, buffer 110 stores its audio data (either in the time domain or thefrequency domain) and buffer 130 stores its metadata, each independentlyof the other.

Processor 40 separately produces research data 120 from the contents ofeach of buffers 110 and 130 which it stores in storage 60. In certainones of these embodiments, one or both of buffers 110 and 130 is/areimplemented as circular buffers storing a predetermined amount oftime-domain audio data representing a most recent time interval thereofas received by microphone 100 and/or reproduced by speaker and/orearphone 70, or downloaded by cellular telephone 38 for reproduction bya different device coupled with cellular telephone 38. Processor 40decodes ancillary codes in the buffered audio data to produce researchdata 120 by converting the time-domain audio data to frequency-domainaudio data and processing the frequency-domain audio data for reading anancillary code therefrom. Where metadata is received in buffer 130, incertain embodiments the metadata is used, in whole or in part, asresearch data, or processed to produce research data. The research datais thus gathered representing exposure to and/or usage of audio data bythe user where audio data is received in acoustic form by the cellulartelephone 38 and where media data and/or other content is received innon-acoustic form (for example, as a cellular telephone communication,as an electrical signal via a cable from a personal computer or otherdevice, as a broadcast or satellite signal or otherwise).

With reference again to FIG. 5, in certain embodiments, the cellulartelephone 38 comprises a research data source 42 coupled by a wired orwireless coupling with processor 40 for use in gathering further oralternative research data to be communicated to a research organization.In certain ones of these embodiments, the research data source 42comprises a location data producing device or function providing dataindicating a location of the cellular telephone 38. Various devicesappropriate for use as the research data source 42 include a satellitelocation signal receiver, a terrestrial location signal receiver, awireless networking device that receives location data from a network,an inertial location monitoring device and a location data producingservice provided by a cellular telephone service provider. In certainembodiments, research data source 42 comprises a device or function formonitoring exposure to print media, for determining whether the user isat home or out of home, for monitoring exposure to products, exposure todisplays (such as outdoor advertising), presence within or nearcommercial establishments, or for gathering research data (such asconsumer attitude, preference or opinion data) through theadministration of a survey to the user of the cellular telephone 38. Incertain embodiments, research data source 42 comprises one or moredevices for receiving, sensing or detecting data useful in implementingone or more of the foregoing functions, other research data gatheringfunctions and/or for producing data ancillary to functions of gathering,storing and/or communicating research data, such as data indicatingwhether the panelist has complied with predetermined rules governing theactivity or an extent of such compliance. Such devices include, but arenot limited to, motion detectors, accelerometers, temperature detectors,proximity detectors, satellite positioning signal receivers, RFIDreaders, RF receivers, wireless networking transceivers, wireless devicecoupling transceivers, pressure detectors, deformation detectors,electric field sensors, magnetic field sensors, optical sensors,electrodes, and the like.

With reference to FIG. 6, there is illustrated a personal digitalassistant (PDA) 200 modified to gather research data. The PDA 200comprises a processor 210 operative to exercise overall control and toprocess data for, among other purposes, transmission or reception by thePDA 200. Communications 220 is coupled to the processor 210 and isoperative under the control of processor 210 to perform those functionsrequired for establishing and maintaining two-way communications over anetwork (not shown for purposes of simplicity and clarity).

In certain embodiments, processor 210 comprises two or more processingdevices, such as a first processing device that controls overalloperation of the PDA 200 and a second processing device that performscertain more specific operations such as digital signal processing. Incertain embodiments, processor 210 employs a single processing device.In certain embodiments, some or all of the functions of processor 210are implemented by hardwired circuitry.

PDA 200 further comprises storage 230 coupled with processor 210 andoperative to store software that runs on processor 210, as well astemporary data as needed. In certain embodiments, storage 230 comprisesa single storage device, while in others it comprises multiple storagedevices. In certain embodiments, a single device implements certainfunctions of both processor 210 and storage 230.

PDA 200 also includes a user input 240 coupled with processor 210, suchas a keypad, to enter commands and data, as well as a display 250coupled with processor 210 to provide data visually to the user underthe control of processor 210.

In certain embodiments, the PDA 200 provides additional functions and/orcomprises additional elements. In certain embodiments, PDA 200 providescellular telephone functionality, and comprises a microphone and audiooutput (not shown for purposes of simplicity and clarity), as well as anability of communications 220 to communicate wirelessly with a cell of acellular telephone network, to enable its operation as a cellulartelephone. Where PDA 200 possesses cellular telephone functionality, incertain embodiments PDA 200 is employed to gather, store and/orcommunicate research data in the same manner as cellular telephone 38(such as by storing appropriate research software in storage to run onprocessor), and communicates with system 10 in the same manner to setup, promote, operate, maintain and/or terminate a research operationusing PDA 200.

In certain embodiments, communications 220 of PDA 200 provides wirelesscommunications via Bluetooth protocol, ZigBee™ protocol, wireless LANprotocol, infrared data link, inductive link or the like, to a network,network host or other device, and/or through a cable to such a network,network host or other device. In such embodiments, PDA 200 is employedto gather, store and/or communicate research data in the same manner ascellular telephone 38 (such as by storing appropriate research softwarein storage to run on processor), and communicates with system 10 in thesame manner (either through a wireless link or through a connection,such as a cable) to set up, promote, operate, maintain and/or terminatea research operation using PDA 200.

PDA 200 receives audio data in the form of acoustic data and/or audiodata communicated in electronic form via a wireless or wired link. PDAstores research software enabling PDA 200 to gather research data,namely, data indicating exposure to such audio data, by controllingprocessor 210 to gather such data and communicate it via communications220 to a research organization. The research software in certainembodiments also controls processor 210 to store the data in storage 230for subsequent communication. That is, processor 210 is controlled toread codes from the audio data in the same manner as any one or more ofthe embodiments explained hereinabove.

In certain embodiments, the PDA 200 comprises a research data source 260coupled by a wired or wireless coupling with processor 210 for use ingathering further or alternative research data to be communicated to aresearch organization. In certain ones of these embodiments, theresearch data source 260 comprises a location data producing device orfunction providing data indicating a location of the cellular telephonePDA 200. Various devices appropriate for use as source include asatellite location signal receiver, a terrestrial location signalreceiver, a wireless networking device that receives location data froma network, an inertial location monitoring device and a location dataproducing service provided by a cellular telephone service provider. Incertain ones of these embodiments, research data source 260 comprises adevice or function for monitoring exposure to print media, fordetermining whether the user is at home or out of home, for monitoringexposure to products, exposure to displays (such as outdooradvertising), presence within or near commercial establishments, or forgathering research data (such as consumer attitude, preference oropinion data) through the administration of a survey to the user of thePDA 200. In certain ones of these embodiments, research data sourcecomprises one or more devices for receiving, sensing or detecting datauseful in implementing one or more of the foregoing functions, otherresearch data gathering functions and/or for producing data ancillary tofunctions of gathering, storing and/or communicating research data, suchas data indicating whether the panelist has complied with predeterminedrules governing the activity or an extent of such compliance. Suchdevices include, but are not limited to, motion detectors,accelerometers, temperature detectors, proximity detectors, satellitepositioning signal receivers, RFID readers, RF receivers, wirelessnetworking transceivers, wireless device coupling transceivers, pressuredetectors, deformation detectors, electric field sensors, magnetic fieldsensors, optical sensors, electrodes, and the like.

As noted hereinabove, research software is provided to those of theforegoing devices implementing research operations by means ofprogrammed processors. In certain embodiments, the research software isstored at the time of manufacture. In others, it is installedsubsequently, either by a distributor, retailer, user, service provider,research organization or other entity by download to the respectivedevice or by installation of a storage device storing the researchsoftware as firmware, or otherwise.

FIG. 7A illustrates a system 300 for determining a proximity of twoportable research monitors 302 and 304. FIG. 7B partially illustrateseach of the two portable research monitors 302 and 304, which isimplemented in certain embodiments by the addition of a short rangewireless transmitter 310 and a wireless receiver 320 to any of researchdata monitor 10, PUA 27, cellular telephone 38 and PDA 200. In certainembodiments, transmitter 310 and/or receiver 320 are implemented byexisting components of monitor 10, cellular telephone 38 and PDA 200,such as a Bluetooth or ZigBee transceiver, a wireless networkingtransceiver or other RF transceiver, an infrared or visible lighttransceiver, or an acoustic transceiver (implemented, for example, by amicrophone and speaker of the cellular telephone 38 or PDA 200). Varioustechniques may be employed to determine whether two monitors are inproximity, such as signal strength and data error rates. For example, ifa monitor receives a transmission from another monitor that is below apredetermined signal strength or with a data error rate that is greaterthan a predetermined threshold, it may determine that the transmittingmonitor is not in proximity, and vice versa. In certain embodiments, forexample, where line-of-sight or acoustic transmission is employed, orwhere low power RF transmission is used, such techniques may not benecessary.

The respective processor 14, 32, 40 or 210 of the research data monitor10, PUA 27, cellular telephone 38 or PDA 200, referred to herein asmonitor 302 or monitor 304, is coupled with the short range transmitter310 to control transmissions thereby. The respective processor controlstransmitter 310 to transmit a short-range communication indicatingeither its presence or including data identifying the respective one ofmonitor 302 or 304. Such communication is transmitted eitherperiodically, from time to time, or upon the occurrence of some event orcondition (such as a change of location or motion of the monitor 302 or304, and/or receipt of a short range transmission from the other one ofmonitor 302 or 304). In certain embodiments, transmitter 310 transmitssuch communication based on an internal control, rather than or inaddition to a control from the respective processor. Receiver 320 iscoupled with the respective processor to supply data from acommunication received by receiver 320 from the other one of monitor 302or 304.

When one of the monitors 302 or 304 receives such a communication fromthe other thereof, in certain embodiments, the respective processorcontrols the transmitter 310 to transmit a responsive communicationindicating its proximity to the other monitor or providing dataidentifying its monitor. In certain embodiments, transmitter 310responds directly to the receipt of the communication to transmit suchresponsive communication for receipt by the other monitor. In thismanner, the two monitors detect that they are in proximity to oneanother.

In certain embodiments where such proximity is detected, the twomonitors exchange identification data and store the identification datafrom the other thereof with a time stamp to record their proximity andthe time it was detected. One or both of monitors 302 and 304subsequently transmits a presence or identification communication forreceipt by the other, either periodically or from time to time, or uponthe occurrence of an event such as a change of location or movement ofthe respective monitor, or the receipt of another communication from theother monitor or the failure to receive such a communication after aperiod of time or the occurrence of such an event or condition.

In certain ones of such embodiments, a system, such as research datagathering system 21 of FIG. 2C, receives the data gathered by monitors302 and 304, including ancillary codes read thereby andproximity/identification data stored by the monitors 302 and 304, andprocesses such codes and data to determine whether either monitor readany codes that the other either did not read or failed to readcompletely. Where the system finds such code omissions and detects thatthe two monitors were in close proximity when one failed to read such acode, either partially or completely, it augments the data records fromsuch monitor by adding a copy of the code successfully read by the othermonitor.

In certain embodiments, where monitors 302 and 304 detect that they arein proximity, each transmits one or more codes, or all codes, it hasread to the other. Each monitor processes this received data todetermine whether it has either failed to read such code or read itincompletely and augments its data records with a copy of the codereceived from the other monitor. In certain embodiments, either of themonitors 302 and 304 when they are in proximity, transmits acommunication to the other when it has failed to read a code or read acode incompletely and the other, if it has successfully read the code,responds by transmitting the code to the monitor that has failed to readit. The latter then supplements its data records with the code receivedfrom the other monitor.

In certain embodiment, a first one of monitors 302 and 304 transmits acommunication to the second one of monitors 302 and 304 indicating thatit has read or is reading a code i9n received media data. If the secondmonitor receiving such communication either has not read a code ordetects that it has failed to read all or a portion of a code (forexample, based on the codes or portions its has been able to receive),it transmits a responsive communication to the first monitor indicatingthis. The first monitor responds to this communication from the secondmonitor by transmitting a further communication including all or aportion of the codes it has read. Upon the receipt of such furthercommunication the second monitor augments its data records to add theomitted data.

Each of monitors 302 and 304 stores the codes it has read with time dataindicating the times (on a relative or conventional time scale) at whichthe codes were received and/or read. Such time data may also include thedate. In certain embodiments, the processor 14, 32, 40 or 210 producesthe time data using an internal time data source. In certainembodiments, the time data is produced by a time data source 330 coupledwith the processor 14, 32, 40 or 210 to provide the time data thereto.

In certain embodiments, the monitors 302 and 304 are synchronized bytransmitting time data to the other. In certain ones of suchembodiments, both transmit such time data, while in certain ones of suchembodiments only one of monitors 302 and 304 transmits such time data.When either or both of monitors 302 and 304 receives such time data fromthe other, it compares the received time data to its own time data todetermine any offset therebetween and stores this offset. When themonitor 302 or 304 receives a code or codes from the other, it alsoreceives the time data from the other associated with such code orcodes, and adjusts the received time data with the offset to synchronizethe received codes with its own time data. In this manner the monitorreceiving a code or codes from the other is able to match the receivedcode or codes with any it has read partially or failed to read in orderto augment its records with the received code or codes to complete anycodes it has read partially or add any it failed to read. Where themonitors 302 and 304 are already synchronized to a reference source andare able to maintain such synchronization within an acceptabletolerance, it is possible to forego such time data exchange. However,where a device such as PUA 27, cellular telephone 38 or PDA 200 isemployed as monitor 302 or 304, its time data may differ substantiallyfrom that of the other, so that synchronization as described hereinaboveis preferred.

In certain embodiments, three or more monitors detect their proximity inthe same manner as monitors 302 and 304 by communicating presence dataalong with respective identification data and transmit codes to augmentthe records of one or more of the monitors in the same fashion. Varioustechniques are known for minimizing or preventing data collisions in thewireless ad hoc networks that may be employed in the foregoingembodiments, for example, by using respectively different transmissiondelays and collision detection techniques or by means of frequencydivision, time division or code division multiplexing communicationstechniques (as used, for example, in Bluetooth, ZigBee and WiFicommunications).

In certain embodiments, time synchronization of codes read by two ormore monitors is carried out by a processor, such as processor 25 ofsystem 21, a data collection server or a processor in a household, thatreceives the data of the monitor that failed to read the code or codesand the data from the one or more other monitors. In certain ones ofsuch embodiments, time data received from the monitors representing oneor more events for which system time was also recorded, is compared bythe processor with the recorded system time for such event or events, todetermine any offsets therebetween. Such events may comprise dockingtimes, data uploading or downloading times, or other timed eventscommonly recorded by the monitors and by any system synchronized tosystem time. The determined offsets are applied to the data receivedfrom the monitors to synchronize their time data with system time toenable matching of data received from the various monitors and to addcorresponding codes to the received data as appropriate wherecorrespondence data (for example, data indicating proximity of themonitors) indicates that they received the same media. In certain onesof such embodiments, the processor accesses data for the monitorsrepresenting times at which they were synchronized with system timealong with data representing time or clock frequency drift data of therespective monitors. The processor then processes this data to determineany offsets of the time data from the monitors from system time tosynchronize their code data.

Omitted codes are recovered in certain embodiments using codes andassociated time stamps received from broadcasters, cablecasters,satellite media distributors and other media providers. In suchembodiments, the processor (such as processor 25 of system 21, a datacollection server or a processor in a household) synchronizes such codeswith those received from one or more monitors (either by synchronizingboth to system time or synchronizing the codes from the monitors withthose received from a broadcaster, cablecaster or other media provider),and augments the code data received from the monitors with that receivedfrom a media provider to provide missing codes or portions thereof.

In certain embodiments, in place of, or in addition to timesynchronization as described hereinabove, a monitor that has failed toread an ancillary code in its entirety and receives a corresponding dataset from one or more other monitors, matches its decoded data with thedata received from the one or more other monitors to determine a timeoffset therebetween or to determine which of the data received from theone or more other monitors corresponds in time with the codes it failedto read in whole or in part. Once such a match has been determined bythe receiving monitor, it augments its data with that received from theone or more other monitors either by applying the determined time offsetto the data received therefrom or by inserting the matching data asneeded to complete its own data. In certain ones of such embodiments,such matching operation is carried out by correlating the symbol streamthat the receiving monitor has successfully read in part with a symbolstream received from the one or more other monitors. In certain ones ofsuch embodiments, the receiving monitor matches the data received fromthe one or more other monitors by matching one or markers included inits data with one or more markers in the data received from the one ormore other monitors. The marker or markers so used may be one or more ofmarker symbols included in the respective data and start and end pointsfor respectively different ancillary codes included in the data. Incertain embodiments, such matching is carried out by a processor, suchas processor 25 of system 21, that receives the data of the monitor thatfailed to read the code or codes and the data from the one or more othermonitors. In certain ones of such embodiments, the processor carries outsuch matching based also on a similarity of time stamps in such datawith or without additional data indicating that the monitors were inproximity during a corresponding time period or time. In certainembodiments, the matching process is carried out by a processor in ahousehold that receives the data from such monitors (for example, frommonitors carried by two or members of the same household), or by a datacollection server that receives such data. Such embodiments enabledistributed processing for supplying omitted codes.

In a further application, time data associated with code data receivedfrom the various monitors is synchronized with system time to correctinaccuracies in such time data, with or without also augmenting codesomitted from the code data, using any of the time synchronizationtechniques described hereinabove. In certain embodiments, the time datais corrected at a centralized processing facility, at one or more datacollection servers, at one or more processors in a household or in themonitors themselves using any one or more of such synchronizationtechniques. Such synchronization techniques are particularly usefulwhere devices such as PUA 27, cellular telephone 38 or PDA 200 areemployed as monitors, since their internal clocks are often inaccurateso that their time data may differ substantially from system time.

In certain embodiments, both time data of the monitors and system timeare synchronized by reference to widely available timing data from asource external to the research data gathering system. Appropriateexternal sources include terrestrial facilities that providesufficiently accurate timing data, such as the WWVB, WWV and WWVH radiostations operated by the United States National Institute of Standardsand Technology (NIST), the NIST Internet Time Service, timing datasupplied by telecommunications systems, such as landline and mobiletelephone services and Internet services, and satellite transmittedtiming data, such as that included in the data transmitted by GlobalPositioning System (GPS) satellites.

Each of the monitors comprises an internal clock operative to produceinternal clock data, an input operative to receive the widely availabletiming data from such an external source and a processor coupled withthe internal clock and the input to receive the internal clock data andthe widely available timing data and configured to adjust the internalclock data based on the widely available timing data. In variousmonitors, the internal clock comprises an oscillator providing an outputsufficiently stable in frequency, such as a crystal controlledoscillator or an oscillator control by another stable frequencyregulating device (for example, a SAW device or silicon resonator). Incertain embodiments, the input comprises a radio frequency (RF) receiverconfigured to receive accurate timing data from an RF transmitter suchas one of radio stations WWVB, WWV and WWVH or from a GPS satellite. Theuse of a GPS receiver in a monitor for this purpose provides theadditional benefit of location data enabling tracking of the location ofthe monitor by means of latitude and longitude coordinates supplied bythe GPS receiver and stored by the monitor with its other data recordsfor communication to a system processing facility. In stationarymonitors, such as set top monitors and desktop personal computers, afurther option is the use of widely available timing data via theInternet. Such data may also be employed in portable devices havinginternet access, such as PDA's and cellular telephones. In devices sucha mobile telephone devices having access to a telecommunicationsservice, accurate timing data provided by such a system may also beused.

The research data gathering system also comprises a processing facilityconfigured to process research data gathered by the plurality ofresearch data gathering devices. The processing facility comprises asystem clock operative to produce system clock data for the researchdata gathering system, an input coupled to receive the widely availabletiming data and a processor coupled with the internal clock and theinput to receive the system clock data and the widely available timingdata and configured to adjust the system clock data based on the widelyavailable timing data. The system clock comprises an oscillatorproviding sufficiently stable timing data for use system-wide. Theinput, whether an RF receiver, Internet connection, telephone connectionor other source of widely available timing data, receives the sametiming data as received by the inputs of the various monitors of thesystem, for synchronizing the system clock and the internal clocks ofeach of the monitors.

Although various embodiments have been described with reference to aparticular arrangement of parts, features and the like, these are notintended to exhaust all possible arrangements or features, and indeedmany other embodiments, modifications and variations will beascertainable to those of skill in the art.

What is claimed is:
 1. A method for processing research data gathered bya plurality of monitoring devices, the research data including messagedata read by the monitoring devices from media data encoded with codesencoding the message data, a first portion of the message data as readby one or more of the monitoring devices omitting a data portion, themethod comprising: processing the research data to produce a database ofcorresponding message data indicating a probability that the media datarelates to other media data; receiving the omitted data portion based onthe corresponding message data from a source other than the one or moreof the monitoring devices that read the first portion of the messagedata omitting the data portion; and determining whether thecorresponding message data has been received from at least N monitoringdevices, wherein N is a natural number, and N is statisticallyestablished as a number of monitoring devices having read the completemessage data which is sufficiently large to satisfy a probability thatthe message data were correctly read by the plurality of monitoringdevices; and on the condition that the corresponding message data hasbeen received from the at least N monitoring devices; processing thecorresponding message data and the data portions to produce completemessage data.
 2. The method of claim 1, including storing the completemessage data in a media exposure data database for use in producingreports of media data exposure.
 3. The method of claim 1, includingmatching the message data to produce match data indicating which of themessage data correspond, and wherein the processing of the research datato produce the database is based on the match data.
 4. The method ofclaim 1, wherein the processing of the research data to produce thedatabase is based on timing data indicating times or time periods atwhich the monitoring devices gathered the message data.
 5. The method ofclaim 1, wherein the processing of the research data to produce thedatabase is based on further message data gathered by the monitoringdevices by reading further codes encoded in the media data, the furthermessage data representing information differing from informationrepresented by the message data.
 6. The method of claim 5, wherein thecodes and the further codes are encoded as layers in the media data. 7.The method of claim 5, wherein the message data represents at least oneof program content of the media data, a network distributing the mediadata and a station or channel providing the media data, and the furthermessage data represents a different one of the program content, thenetwork and the station or the channel.
 8. The method of claim 1,wherein the processing of the research data to produce the database isbased on data indicating a location or locations of the monitoringdevices.
 9. The method of claim 1, including receiving the omitted dataportion from a reference database.
 10. The method of claim 1, whereinthe omitted data portion is obtained from data produced by one or moreof the monitoring devices other than the one or more monitoring devicesthat read the first portion omitting the data portion.